Thanks again Jason!
OK, I got it to work with your instructions. Straightforward and simple. It works fine so far, albeit I opened and closed it only about 10 times this evening.
So interestingly, my Chamberlain B750 owners manual did not have the same instructions you provided.
The MyQ Smartphone Control information is on the same page (32) you show, it lists the ‘You will need:’ the same, but it then jumps to ‘Download MyQ App to setup an account and connect’.
It is missing the part about ‘activate WiFi mode’ and ‘use your mobile device to connect to the home wifi’.
Not sure I would have got the same result as simple if I had set up an account through the App first…